Two domains pointing to the same server

Hi @ all. 

After everything went great for a long time on Plesk, I switched to DA and had to face massive problems. After weeks of struggle I found out about CWP and switched to CentOS. Outstandingly great so far. 

Since I'm quite new to all of this, I'd like to know if this structure is correct. I'm a little overwhelmed tbh. 

All possible advertising has been redacted.

Hostname is: hostname.crazyfunnydomain.com

CWP shows (and that what bothers me): ns1.fancycooldmain.com & ns2.fancycooldmain.com for both accounts/domains - I get it, same nameserver - but why not the one with the hostname?!? And has "ns1- & ns2 .centos-webpanel.com" to be edited?

https://ibb.co/YjV6bjQ
https://ibb.co/BfghLDB

https://ibb.co/9v24YwG
https://ibb.co/BtVn0gL 

The sites are both reachable at this moment. But still I'd like to have it perfect. 

Hopefully someone can share his/her expertise with me. 

Kind regards 
Alexander